CHEN Jie,CHEN Kang,ZHU Chun-wei,et al.Pilot Study on Combined Process of Coagulation，Sedimentation and PVCComposite Membrane for Treating Polluted Source Water[J].China Water & Wastewater,2017,33(01):7-11.
混凝/沉淀/PVC复合膜工艺处理受污染源水的中试
- Title:
- Pilot Study on Combined Process of Coagulation，Sedimentation and PVCComposite Membrane for Treating Polluted Source Water
- 摘要:
- 针对北方受污染水源水的水质特点，基于“混凝/沉淀/PVC 复合膜”工艺，通过中试考察了 PVC 复合膜的水质净化效果和膜系统运行情况。在 PVC 复合膜出水中未检测到总大肠菌群，出水浊度平均为 0． 054 NTU; 复合膜对 CODMn、余铝和藻类的平均去除率分别为 27． 4% 、68% 、99% 。以 25、30 和 35 L /( m2·h) 的膜通量运行时，TMP 均在 30 kPa 以下，PVC 复合膜的运行压力较低。气水反洗和维护性清洗能明显降低 PVC 复合膜的 TMP，缓解膜污染。膜通量为 25 L /( m2·h) 时，其 TMP 基本稳定在 7． 7 ～ 15 kPa; 膜通量为 30 L /( m2·h) 时，在加氯预处理条件下膜污染较轻; 以35 L /( m2·h) 的膜通量运行时，过滤60 min 反洗1 次能够有效降低膜污染; 建议维护性清洗周期为 14 d。
- Abstract:
- The pollutants removal efficiencies and operating characteristics of PVC composite mem-brane were investigated in pilot-scale experiments based on the combined process of coagulation，sedi-mentation and PVC composite membrane for purifying the polluted source water in northern China． Theresults showed that the total coliforms were not detected in membrane effluent，the effluent turbidity was0． 054 NTU on average，and the average removal rates of PVC composite membrane for CODMn，residualaluminum ion and algae were 27． 4% ，68% and 99% ，respectively． The trans-membrane pressure( TMP) of PVC composite membrane were always below 30 kPa when the membrane was operated at fluxof 25 L /( m2·h) ，30 L /( m2·h) and 35 L /( m2·h) ，respectively，which suggested that the PVCcomposite membrane was operated with low pressure． Regular air-water backwash and EFM could obvi-ously reduce TMP and alleviate membrane fouling at the same time． The TMP was between 7． 7 and 15kPa when PVC composite membrane was operated at flux of 25 L /( m2·h) ． However，membrane foulingwas lower with chlorination pretreatment at flux of 30 L /( m2·h) ，and it could be effectively mitigatedby a backwash after filtration duration of 60 min when PVC composite membrane was operated at the fluxof 35 L /( m2·h) ． Also，it suggested that the EFM period cycle was 14 days for once.
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